The front wall of my 2016 frunk is a cover to the battery that also had a stretch-cord for holding, in my case, a Ziploc bag with important docs, but can hold other stuff too. Post a pic if you can and you might get a better answer! It could also be for the bike lock that some have found, if I remember correctly.
Don't have a disk lock so can't help you there.
There can be a clunk going 1 > 2 at low speeds I've found. Accelerating faster remedies that though
I switched to the Madstad which you will find a lot of people have and like. There are other choices to, search the forums and you'll find lots of results and pictures. I have the SW-M Kobra handguards with extensions and LED's installed, there are a couple of Barkbuster models that will work and are very popular, and there is an Acerbis model (with optional lights) as an option too.
I used D for a while, then S1 > S2 > S3 and then back to S2. This gave me a good upshift/downshift combo. I primarily use M now and up/down shift when I want, although it will downshift on it's own still as it approaches the stall point. This is nice for gentle coasting up to red lights when there's nothing behind you. I also find I very rarely manually shift into 1st. I will downshift as far as 2nd and the bike will autoshift to 1st as I come to a stop.
I average 65-70 in the summer and 60-65 in the early spring/ late fall. I also don't mind riding for a while in 'reserve' mode and will regularly go 40 miles or so on it. I usually fill up when I get 5 miles or so into 0.7 of the reserve fuel used. It will go to 0.8 and that's when you're really on fumes! I only have a 13 mile ride to work and can pass multiple gas stations so I've run it quite low before! I generally don't start reserve mode until about 180 miles, so getting 200 miles a tank shouldn't be a problem for you. I have the 18" Madstad, weigh probably 200 geared up and have a 10lb bag on my rear carrier.
I came from the PCX150 and primarily use it as a back road commuter. Power and speed are plenty! Some here tour the nation with it, me I'd probably choose the ST1100/1300 or the VFR1200X (DCT) if I was planning on a lot of serious trips.